how about a separate section for jokes? The jokes would have to be somehow gaming/puzzling/mathematically related, but we could have a daily joke in addition to the two puzzles per day.

Agree that it would be unlikely to come up with one joke a day, unless people just harvested "mathjokes.com" or something, inwhich case the duplication would obviously be a little silly.

I assume that you're looking for straight jokes, nothing to be solved. Maybe start a forum thread..? See if it gets the interest?